PLATE XXIV. 



Fig. 1. — Edmondia am&na. A left valve, almost denuded of shell, showing 

 pallial line and adductor scars. Lower Limestone Series, Burn Anne. Collection 

 of Mr. J. Smith. (Page 150.) 



Fig. 2. — Edmondia amxna. A right valve. Same locality and Collection. 

 (Page 150.) 



Fig. 3. — Edmondia acuta. The cast of a left valve, with Fig. 3 a its right valve, 

 and Fig. 3 b a view of the umbones and hinge line. Same locality and Collection. 

 (Page 151.) 



Figs. 4 and 5. — Edmondia acuta. A right and left valve. Same collection and 

 Locality. (Page 151.) 



Fig. 6. — Edmondia truncata. Showing both valves. From the Calciferous 

 Sandstone Series, Grlencartholm. My Collection. (Page 149.) 



Figs. 7 and 8. — Edmondia truncata. Same locality and Collection. (Page 149.) 



Fig. 9. — Nothamusium radiatum. A right valve, with Fig. 9 a, a view of the 

 hinge plate, from Little Island, co. Cork. In the Collection of Mr. J. Wright. 

 (Page 160.) 



Fig. 10. — Nothamusium radiatum. A right valve in the young condition. Same 

 locality and Collection. (Page 160.) 



Fig. 11. — Nothamusium radiatum. A full-grown shell from Narrowdale, 

 Staffordshire. My Collection. (Page 160.) 



Fig. 12. — Nothamusium transversum. A right valve from the Four Laws 

 Limestone, Coomb, Northumberland. My Collection. (Page 161.) 



Fig. 13. — Nothamusium transversum. The cast of the interior from Auchenmade, 

 with Fig. lor/, a view of the hinge plate and cardinal tooth. In the Collection of 

 Mr. J. Smith. (Page 161.) 



Fig. 14. — Schizodu* obovatus. A right valve from the Carboniferous Limestone 

 of Castleton. My Collection. (Page 143.) 



Fig. 15. — Schkodus obovatus. A right valve, the type of M'Coy's Axinus 

 obovatus. In the Griffith Collection, Museum of Science and Art, Dublin. (Page 

 143.) 



Fig. 16. — Parallelodon elongatus. A left valve from theKnipe Scar Limestone, 

 Shap. (Page 138.) 



